[RFT] Truecrypt rescue image support

[Vladimir 'φ-coder/phcoder' Serbinenko]

Hello, all. Basing my code on the information about truecrypt rescue
image layout from Attila Lendvai's project I wrote its support in GRUB.
Now you can do
truecrypt <truecrypt ISO>
boot
instead of having to go through ruby converter.
Since I don't use truecrypt myself I couldn't test it.
Could someone test it?
It's available from
http://git.savannah.gnu.org/cgit/grub.git/log/?h=truecrypt
@Attila: Thanks for figuring out the protocol. Do you have any problems
with that information being used in that way?

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